5-[N-(6-(Trifluoracetamido)hexyl)-(E)-acrylamido]uridine is a variation of 5-[3-(Trifluoroacetamido)-1-(E)-propenyl]uridine (T785015) which can be used as reactant/reagent in preparation of modified nucleosides, nucleotides, and nucleic acids, and uses thereof for human granulocyte-colony stimulating factor-modified mRNA-induced cell proliferation.